CN101714341B - Liquid crystal display device and driving method of the same - Google Patents
Liquid crystal display device and driving method of the same Download PDFInfo
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- CN101714341B CN101714341B CN200910173683XA CN200910173683A CN101714341B CN 101714341 B CN101714341 B CN 101714341B CN 200910173683X A CN200910173683X A CN 200910173683XA CN 200910173683 A CN200910173683 A CN 200910173683A CN 101714341 B CN101714341 B CN 101714341B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/36—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of a graphic pattern, e.g. using an all-points-addressable [APA] memory
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0252—Improving the response speed
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of display data
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2340/00—Aspects of display data processing
- G09G2340/16—Determination of a pixel data signal depending on the signal applied in the previous frame
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Abstract
A LCD device and a LCD driving method are disclosed. The LCD device and the driving method thereof select one among a plurality of threshold values provided along gray level regions of the pixel data as a threshold value for pixel data in a current frame interval. Accordingly, the number of times over-driving occurs due to a noise when a still image is displayed can be minimized.
Description
The cross reference of related application
The application requires in the right of priority of the korean patent application No.10-2008-0096509 of submission on October 1st, 2008 according to 35 U.S.C 119, and it is incorporated herein by reference in full.
Technical field
The application relates to liquid crystal display (LCD) device, more specifically, relates to and is suitable for minimizing liquid crystal display device of overdriving unusually and the driving method thereof that causes because of noise.
Background technology
When the LCD device of the especially high picture quality of display device of realizing high picture quality, it is the emphasis of paying close attention to that the visuality of moving image strengthens.If show moving image through commercial LCD device, then target travel is shown as hangover.In other words, the motion blur phenomenon appears in the commercial LCD device.Because the maintenance display characteristic of LCD device and human eye move through pursuit movement target and integrated its and discern the fact of said target, produce the motion blur phenomenon.Along with the movement velocity increase of target, this motion blur phenomenon becomes even more serious.
For head it off, proposed can high-speed responsive liquid crystal and the over-driving method that is used for the gradual change of Rapid Realization target, and continue research be used to strengthen in the middle of other method of response time of gradual change.
Over-driving method provides the pixel data with grey level higher than the grey level of input pixel data to liquid crystal panel, thus the response time that temporarily strengthens liquid crystal.Because strengthen the liquid crystal response time through overdriving, so can be minimized in the motion blur phenomenon that shows on the liquid crystal panel.More specifically; Over-driving method compares from the pixel data of the present frame of outside and the pixel data of former frame; And to liquid crystal panel the pixel data with gradual change higher than the gradual change of the pixel data of present frame is provided, thereby the response time that strengthens liquid crystal according to comparative result.
If on liquid crystal panel, show in some frame periods of rest image, in the pixel data of present frame, comprise noise component, then changed the pixel data of present frame.In this case, the pixel data that the LCD device relatively changes and the pixel data of previous frame are also carried out and are overdrived, and this is because it is and previous frame pixels with different data with the pixel data identification that changes.
Like this, when comprising noise component in the pixel data at present frame, the LCD device is carried out and is overdrived and demonstration and rest image pictures different, thereby it is unusual to produce visual picture quality.
Summary of the invention
Therefore, embodiment of the present invention relates to a kind of LCD device of having avoided one or more problems that limitation and shortcoming caused of prior art basically.
The purpose of this embodiment provides and when showing rest image, is suitable for minimizing the number of times and prevent LCD device and the driving method thereof that visual picture quality is unusual of overdriving unusually that produces owing to noise.
Another purpose of this embodiment provides the LCD device and the driving method thereof that can strengthen picture quality.
The another purpose of this embodiment provides the LCD device and the driving method thereof that can reduce power consumption.
To in description subsequently, set forth the further feature and the advantage of these embodiments, its part will be obvious according to instructions, perhaps can know through putting into practice these embodiments.To realize and obtain the advantage of these embodiments through specifically described structure in instructions and claims and accompanying drawing.
According to a general aspect of this embodiment, a kind of LCD comprises: the liquid crystal panel with pixel of the matrix shape be arranged to; In frame unit, receive the input part of pixel data; Drive the driver of liquid crystal panel; During a frame period, postpone frame memory from the pixel data of input part; The data difference counter calculates in delay pixel data and the data difference between the pixel data that input part receives from frame memory; The threshold value determiner; Among a plurality of threshold values of being set up along the grey level scope of the division of pixel data, confirm and the pixel data corresponding threshold that receives from input part; Wherein said threshold value determiner is distributed to the threshold value that is used for low grey level scope with little value, and value is greatly distributed to the threshold value that is used for higher grey level scope; Comparer, relatively from the determined threshold value of threshold value determiner and data difference from the data difference counter, and the generation comparison signal corresponding with comparative result; And the device of overdriving, carry out over-drive operation selectively according to comparison signal.
LCD device according to another general aspect of this embodiment can be applied to comprise the liquid crystal panel of the pixel with the matrix shape of being set to, in frame unit, receive the input part of pixel data and drive the LCD device of the driver of liquid crystal panel.This method comprises: during a frame period, postpone the pixel data from input part; Calculating is in pixel data that is postponed and the data difference between the pixel data that input part receives; Among a plurality of threshold values of being set up along the grey level scope of the division of pixel data, confirm and the pixel data corresponding threshold that receives from input part; Its medium and small value is assigned to the threshold value that is used for low grey level scope, and big value is assigned to the threshold value that is used for higher grey level scope; More determined threshold value and the data difference of being calculated are to generate the comparison signal corresponding with comparative result; And carry out over-drive operation selectively according to comparison signal.
For a person skilled in the art, after reading following accompanying drawing and describing in detail, other system, method, feature and advantage will be or will become conspicuous.All these spare systems, method, feature and advantage are intended to be included in this instructions, within the scope of the invention, and are protected by claims.Any restriction to claims should not arranged in this part.Below in conjunction with embodiment other characteristics and advantage are discussed.With the above-mentioned general introduction of understanding present disclosure and following detailed description is exemplary and indicative, and is intended to provide the further explanation to disclosure required for protection.
Description of drawings
Included provide the further understanding of embodiment and be merged in the accompanying drawing that constitutes the application's part, diagram one or more embodiments of the present invention, and be used to explain this disclosure together with instructions.In the accompanying drawings:
Fig. 1 shows the LCD device according to the embodiment of present disclosure; With
Fig. 2 is a process flow diagram of having explained the method for overdriving of the LCD device that determines whether to occur Fig. 1.
Embodiment
To refer in detail to the embodiment of present disclosure now, its example will illustrate in the accompanying drawings.Be provided at hereinafter these embodiments of introducing as an example, thereby their spirit is passed to those of ordinary skill in the art.Therefore, these embodiments can be according to multi-form enforcement, so be not restricted to these embodiments described herein.And, can amplify this size of devices and thickness for the ease of describing in the accompanying drawings.As long as maybe, in comprising this disclosure of accompanying drawing, with using identical reference number to represent identical or similar parts.
Fig. 1 shows the LCD device according to the embodiment of present disclosure.
As shown in Figure 1, comprise liquid crystal panel for displaying images 102, drive the time schedule controller 108 of the driving time of the gate driver 104 of many grid line GL1-GLn on the liquid crystal panel 102, the data driver 106 that drives many data line DL1-DLm on the liquid crystal panel 102 and control gate and data driver 104 and 106 according to the LCD device of the embodiment of this disclosure.
Thin film transistor (TFT) TFT is in response to the scanning gate signal on grid line GL separately, and the pixel data voltage that will apply from data line DL separately switches to liquid crystal cells Clc separately.Liquid crystal cells Clc is included in liquid crystal layer public electrode Vcom respect to one another of central authorities and pixel electrode.Pixel electrode is connected to thin film transistor (TFT) TFT separately.This liquid crystal cells Clc charges into the pixel data voltage that the thin film transistor (TFT) TFT through separately applies.And as long as conducting thin film transistor (TFT) TFT separately, then liquid crystal cells Clc upgrades the voltage that is charged into.
In addition, comprise the thin film transistor (TFT) TFT that is connected separately and the holding capacitor Cst between the last grid line GL thereof in each pixel on the liquid crystal panel 102.Holding capacitor Cst be minimized in liquid crystal cells Clc reduction naturally in the voltage that charges into.
As long as the arbitrary grid line among these many grid line GL1-GLn of starting; Data driver 106 is just in response to the data controlling signal DCS from time schedule controller 108; Generate a plurality of pixel data voltage, and they are imposed on many data line DL1-DLm on liquid crystal panel 102.For this reason, data driver 106 is imported the pixel data that is used for a line from time schedule controller 108 in each time interval, and the input pixel data that uses the gamma voltage collection will be used for a line converts the pixel data voltage of simulating signal shape to.
LCD device according to the embodiment of present disclosure also comprises frame memory, data difference counter 112, threshold value determiner 116, comparer 114, former frame data switch 118 and look-up table 120.The pixel data that frame memory storage is imported in frame unit also will be somebody's turn to do pixel data frame period of delay of in frame unit, importing.Data difference counter 112 calculates the difference between the current frame pixel data that postpone the former frame pixel data of a frame by frame memory 110 and import from external system.Threshold value determiner 116 is confirmed the gray-scale value corresponding threshold with the current frame pixel data.Comparer 114 is relatively from the threshold value of threshold value determiner 116 with from the data difference of difference calculator 112, thereby generates the comparison signal that is used for comparative result.Former frame data switch 118 is exported the former frame pixel data selectively according to comparison signal.At last, whether export the former frame pixel data according to the former frame data switch, according to current frame pixel data or combination current and the former frame pixel data from external system, look-up table is exported the offset data of overdriving.
Frame memory 110 is stored in the interior pixel data from external system of current frame period, so that this pixel data is postponed a frame period (or at interval).Subsequently, the former frame pixel data that postpones a frame period is imposed on data difference counter 112 from frame memory 110.
Former frame pixel data and the data difference between the current frame pixel data that external system applies that data difference counter 112 calculates from frame memory 110.Subsequently, will impose on comparer 114 by the data difference that data difference counter 112 calculates.
Threshold value determiner 116 comprises a plurality of threshold values that the grey level scope that is divided into along the grey of pixel data is provided with differently.Whether threshold value determiner 116 inspection is included in any among a plurality of level ranges from the gray-scale value of the current frame pixel data of external system.And threshold value determiner 116 is selected among a plurality of threshold values and the grey level scope corresponding threshold that comprises the gray-scale value of current frame pixel data.With selected threshold value as the threshold application that is used for the current frame pixel data in comparer 114.
For example, threshold value determiner 116 can comprise that the pixel data grey with 0-255 is divided into 16 threshold values of 16 grey level scopes, shown in following table 1.
If import the current frame pixel data of the 5th grey level G5, then threshold value determiner 116 is selected and the corresponding first threshold TH1 of the first grey level scope that comprises the 5th grey level G5, subsequently this first threshold TH1 is applied to comparer 114.Similarly, when importing the current frame pixel data of the 30th grey level G30, threshold value determiner 116 is selected the second threshold value TH2 corresponding with the second grey level scope that comprises the 30th grey level G30, and the second threshold value TH2 is applied to comparer 114.Like this, confirm the gray-scale value of threshold value.
Can quantitatively increase or be reduced in the threshold value TH that provides in the threshold value determiner 116 according to the user.In other words, the grey level scope can become wideer or narrower on width.
Usually, has the visibility that differs from one another according to dark areas (low grey level scope) and bright area (or high grey level scope) through overdrive pixel data institute images displayed noise.For example, the pixel data institute images displayed noise ratio that has a low gray-scale value of 10 grey levels through overdriving has the low gray-scale value of 10 grey levels through overdriving pixel data institute images displayed noise has higher visuality.Given this, threshold value determiner 116 is distributed to the threshold value that is used for low grey level scope with little value, and value is greatly distributed to the threshold value that is used for higher grey level scope.
Comparer 114 compares the data difference from the selected threshold value of threshold value determiner 116 and calculating in data difference counter 112.And comparer 114 generates the comparison signal corresponding with comparative result.
For example, when current frame pixel data and former frame pixel data had gray-scale value G5 " 5 " and gray-scale value G0 " 0 " respectively, threshold value became first threshold TH1 and data difference is " 0 ".In this case, if first threshold TH1 has gray-scale value " 4 ", then data difference is greater than first threshold TH1.So, comparer 114 can generate the comparison signal of particular logic value (promptly high).
When the data difference that calculates by data difference counter 112 greater than from the selected threshold value TH of threshold value determiner 116 time, comparer 114 generates the comparison signal of particular logic value (for example high logical signal).
On the contrary, when the data difference that calculates from data difference counter 112 was less than or equal to the selected threshold value TH from threshold value determiner 116, comparer 114 generated the comparison signal of basic logic values (for example low logical signal).The comparison signal that will in comparer 114, generate imposes on former frame data switch 118.
Former frame data switch 118 confirms whether it will export to look-up table 120 from the former frame pixel data of frame memory 110.When applying the comparison signal of particular logic value (height) from comparer 114, former frame data switch 118 provides the former frame pixel data from frame memory 110 to look-up table 120.On the contrary, when applying the comparison signal of basic logic value (low) from comparer 114, former frame data switch 118 forces the former frame pixel data from frame memory 110 not impose on look-up table 120.
To input to look-up table 120 from the current frame pixel data of external system with from the former frame pixel data of former frame data switch 118.
Look-up table 120 use from the current frame pixel data of external system as X betwixt mountains location and from the former frame pixel data of former frame data switch 118 as Y betwixt mountains location.And look-up table 120 is included in the overdrive offset data in each region memory storage corresponding with X axle and Y betwixt mountains location.Set up the offset data of overdriving according to come over-compensation in varing proportions along its gray-scale value from a kind of like this mode of the current frame pixel data of external system.
When applying from the current frame pixel data of external system and during from the former frame pixel data of former frame data switch 118; Look-up table 120 reads in the offset data of overdriving in the storage area corresponding with the gray-scale value of current frame pixel data and former frame pixel data, and this offset data of overdriving is exported to data driver 106.On the other hand, when applying and when not applying the former frame pixel data from the former frame data switch, look-up table 120 transfers to data driver 106 with the current frame pixel data from external system from the current frame pixel data of external system.
In other words,, will impose on data driver 106 from the current frame pixel data of external system when the difference between current frame pixel data and former frame pixel data during less than the threshold value confirmed by threshold value determiner 116 originally, and the compensation of not overdriving.On the contrary, when the difference between current frame pixel data and last pixel data during, before imposing on data driver 106, compensate current frame pixel in order to overdrive greater than the threshold value confirmed by threshold value determiner 116.
More specifically, if be presented at the rest image that does not have any difference between former frame pixel data and the current frame pixel data, then data difference is " 0 " and less than the threshold value of being confirmed by threshold value determiner 116.In this case, the current frame pixel data are exported to data driver 106 originally, so that liquid crystal panel 102 is shown as the former frame data with identical picture.
Although shown the rest image that between former frame pixel data and current frame pixel data, does not have any difference, can change current frame pixel data through comprising noise.So, between current frame pixel data and former frame pixel data, generate difference.In this case, if difference is then exported to data driver 106 with the current frame pixel data less than the threshold value of being confirmed by threshold value determiner 116 originally.On the contrary, if this difference greater than the threshold value of selecting by threshold value determiner 116, the offset data of then will overdriving but not the current frame pixel data are exported to data driver 106.
As stated; Only when the difference between former frame pixel data and current frame pixel data during greater than the threshold value confirmed by threshold value determiner 116; Just overdrive according to the LCD device of the embodiment of this disclosure; Even current frame pixel data changes owing to comprising noise, and have the value different with the former frame pixel data.Therefore, compare with needing only the correlation technique LCD device that between current frame pixel data and former frame pixel data, exists difference then to overdrive, this LCD device can reduce the number of times of overdriving that is occurred.
And, as long as between current frame pixel data and former frame pixel data, have difference, the LCD device of the correlation technique of just overdriving, thus cause visual picture quality unusual.Yet, even in the current frame pixel data, comprise noise, also only when the difference between former frame pixel data and current frame pixel data during greater than the threshold value confirmed by threshold value determiner 116, the LCD device of this embodiment of just overdriving.Therefore, the LCD device of present embodiment can reduce the unusual number of times of the visual picture quality of generation.
Fig. 2 is a process flow diagram of explaining the method for overdriving of the LCD device determine whether to occur Fig. 1.
Referring to Fig. 1 and Fig. 2, when from external system input current frame pixel data (S1), the LCD device of this embodiment is in frame memory 110 stored current frame pixel data, and with a frame period of current frame pixel data delay (S2).In other words, the LCD device provides the former frame pixel data.Select among a plurality of threshold values that threshold value determiner 116 is formerly set up and gray-scale value corresponding threshold (S3) from the current frame pixel data of external system.The data difference (S4) of calculating between current frame pixel data and former frame pixel data.
Subsequently, the relatively more selected threshold value and the data difference (S5) that is calculated of the LCD device of this embodiment.If the data difference that is calculated, then generates the comparison signal (S6) of certain logic (promptly high) greater than selected threshold value.In this case, comparison signal makes the former frame pixel data can impose on look-up table 118 (S7), so that overdrive LCD device (S8).
On the contrary, if the data difference that is calculated is equal to or less than selected threshold value, then generate the comparison signal (S9) of basic logic (promptly low).So, the LCD device of this embodiment is not overdrived.In this case, the current frame pixel data are exported to data driver 106 originally.
In other words, the LCD device of this embodiment calculates from the current frame pixel data of external system and the data difference between the former frame pixel data.Confirm among a plurality of threshold values that it is formerly set up along the grey level scope of the division of pixel data and gray-scale value corresponding threshold from the current frame pixel data of external system.Subsequently, data difference and determined threshold value that it is relatively calculated, thus optionally carry out over-drive operation according to comparative result.
Therefore; Even rest image in the display cycle current frame pixel data change and be different from the previous frame pixel data owing to comprising noise; Also only when the difference between former frame pixel data and current frame pixel data during greater than the threshold value confirmed by threshold value determiner 116, such LCD device of just overdriving.Therefore, and as long as the current frame pixel data are different from the former frame pixel data, even different slightly, the correlation technique LCD device of just being overdrived is compared, and the LCD device of this embodiment can reduce the number of times that occurs overdriving.
In addition, the LCD device of the embodiment of present disclosure can reduce electrical power consumed, and this is that it has reduced the number of times of overdriving because compare with the LCD device of correlation technique.
For a person skilled in the art, in disclosure scope, can carry out various modifications and to change will be conspicuous.Thereby disclosure scope will cover the modification and the variation of this embodiment, as long as they fall within claims and the equivalency range thereof.
Claims (7)
1. liquid crystal display device comprises:
Liquid crystal panel has the pixel of the matrix shape be arranged to;
Input part receives pixel data in frame unit;
Driver drives liquid crystal panel;
Frame memory postpones the pixel data from input part during a frame period;
The data difference counter calculates delay pixel data and the data difference between the pixel data that input part receives from frame memory;
The threshold value determiner; Among a plurality of threshold values of being set up along the grey level scope of the division of pixel data, confirm and the pixel data corresponding threshold that receives from input part; Wherein said threshold value determiner is distributed to the threshold value that is used for low grey level scope with little value, and value is greatly distributed to the threshold value that is used for higher grey level scope;
Comparer, relatively from the determined threshold value of threshold value determiner and data difference from the data difference counter, and the generation comparison signal corresponding with comparative result; With
The device of overdriving is carried out over-drive operation selectively according to comparison signal.
2. liquid crystal display device as claimed in claim 1, the wherein said device of overdriving comprises look-up table.
3. liquid crystal display device as claimed in claim 1, wherein when from the data difference of data difference counter during greater than the threshold value confirmed by the threshold value determiner, comparer generates the comparison signal of high logic value.
4. liquid crystal display device as claimed in claim 1, wherein when the data difference from the data difference counter was equal to or less than the threshold value of being confirmed by the threshold value determiner, comparer generated the comparison signal of low logical value.
5. liquid crystal display device as claimed in claim 1, wherein only when from the data difference of data difference counter during greater than the threshold value confirmed by the threshold value determiner, the driving device of overdriving.
6. the method for a driving liquid crystal device, this liquid crystal display device comprise the liquid crystal panel of the pixel with the matrix shape be arranged to, in frame unit, receive the input part of pixel data and drive the driver of liquid crystal panel, and this method comprises:
During a frame period, postpone pixel data from input part;
Calculating is in pixel data that is postponed and the data difference between the pixel data that input part receives;
Among a plurality of threshold values of being set up along the grey level scope of the division of pixel data, confirm and the pixel data corresponding threshold that receives from input part; Its medium and small value is assigned to the threshold value that is used for low grey level scope, and big value is assigned to the threshold value that is used for higher grey level scope;
More determined threshold value and the data difference of being calculated are to generate the comparison signal corresponding with comparative result; With
Carry out over-drive operation selectively according to comparison signal.
7. method as claimed in claim 6 when wherein only working as the data difference that calculated greater than determined threshold value, is just carried out over-drive operation.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2008-0096509 | 2008-10-01 | ||
| KR1020080096509A KR101337120B1 (en) | 2008-10-01 | 2008-10-01 | Liquid crystal display device and driving method of the same |
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| Publication Number | Publication Date |
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| CN101714341A CN101714341A (en) | 2010-05-26 |
| CN101714341B true CN101714341B (en) | 2012-05-23 |
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| CN200910173683XA Active CN101714341B (en) | 2008-10-01 | 2009-09-15 | Liquid crystal display device and driving method of the same |
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| US (1) | US8416269B2 (en) |
| KR (1) | KR101337120B1 (en) |
| CN (1) | CN101714341B (en) |
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| KR101399237B1 (en) * | 2006-12-29 | 2014-05-28 | 엘지디스플레이 주식회사 | Liquid crystal display device and method driving of the same |
| US20110063312A1 (en) * | 2009-09-11 | 2011-03-17 | Sunkwang Hong | Enhancing Picture Quality of a Display Using Response Time Compensation |
| KR101866389B1 (en) * | 2011-05-27 | 2018-06-12 | 엘지디스플레이 주식회사 | Liquid crystal display device and method for driving the same |
| US20130021385A1 (en) * | 2011-07-22 | 2013-01-24 | Shenzhen China Star Optoelectronics Technology Co, Ltd. | Lcd device and black frame insertion method thereof |
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| KR102251180B1 (en) * | 2014-12-22 | 2021-05-11 | 엘지디스플레이 주식회사 | Apparatus for converting image data and display device including the same |
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| CN114743509B (en) * | 2022-03-31 | 2023-11-17 | 海宁奕斯伟集成电路设计有限公司 | Image processing method, device and display device |
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| CN101097698A (en) * | 2006-06-28 | 2008-01-02 | 奇景光电股份有限公司 | Overdriving circuit and method for source drivers |
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| US8416269B2 (en) | 2013-04-09 |
| CN101714341A (en) | 2010-05-26 |
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| KR101337120B1 (en) | 2013-12-05 |
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